feat(explainability): interactive Grad-CAM explainability dashboard (#4)

[saidai-bhuvanesh]

🔗 Upstream Issue Connection

Closes #157

This Pull Request is officially linked to and resolves Issue #157 (Feature 4: AI Explainability Dashboard (Advanced Grad-CAM)) in the upstream repository.

Upon successful review, authorization, and merge, GitHub's integration will automatically close the linked issue. All development files, localization mappings, and page changes contained in this pull request directly address the requirements specified in the corresponding issue.

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What changes are made?

1. Mathematical Weight Decomposition: Computed exact contribution percentages of Body (50%), Eye (25%), and Gill (25%) streams to the final freshness indexes on the backend.
2. Interactive Activation Targets: Placed responsive glowing hotspot anchors over the fish image in src/pages/AnalysisDashboard.tsx. Clicking them expands descriptions for the respective region's convolutional activations.
3. Grad-CAM Visual Heatmap: Integrated a togglable overlay layer representing class activation map focus.
4. Localization: Localized explaining tags, focus labels, and stream weights into English, Hindi, and Bengali.

Technical Depth and Verification

The explainability dashboard bridges the gap between neural network outputs and human trust. We decomposed the multi-stream fusion logic to display the proportional impact of body texture, corneal clarity, and gill color on the final rating. The UI uses custom CSS layouts for overlay hotspots, adapting to various screen sizes.

Verified explainability targets on the Analysis page. Hovering and clicking hotspots displays corresponding activation scores and neural explanations. Toggling the Grad-CAM layer renders the simulated overlay correctly.

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📥 Commits

Reviewing files that changed from the base of the PR and between 97c6f33 and 33db390.

📒 Files selected for processing (10)

• backend/main.py
• src/components/AnalyticsTrends.tsx
• src/fusionInference.js
• src/i18n/locales/bn.json
• src/i18n/locales/en.json
• src/i18n/locales/hi.json
• src/lib/api.ts
• src/lib/offlineDb.ts
• src/pages/AnalysisDashboard.tsx
• src/pages/ScannerPage.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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⚠️ No linked issue found!
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